dashboard cover to reduce windows glare

I'm wondering if I could get recommendations for a dashboard cover for the purpose of reducing window glare. This is for a 2007 Prius, but this is a more general question since most dashboard covers are available for multiple models. The Prius does have a particularly troubling window glare problem--the dashboard is shiny black, with a textured surface. The textured surface creates a complex glare pattern that greatly reduces visibility and legibility of signs. I pretty much can't read street signs when the sun is shining directly on my dash.

Mike